| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.87 | 11.95 | 6.26 |
| 2024 | 7.48 | 11.18 | 5.51 |
| 2023 | 14.38 | 19.1 | 10.54 |
| 2022 | 17.24 | 21.83 | 14.25 |
| 2021 | 14.32 | 19.46 | 12.88 |
| 2020 | 13.76 | 20.39 | 8.15 |
| 2019 | 8.62 | 13.17 | 4.98 |
| 2018 | 7.03 | 9.23 | 4.53 |
| 2017 | 9.09 | 10.6 | 7.72 |
| 2016 | 10.19 | 12.27 | 7.48 |
| 2015 | 9.75 | 17.96 | 5.31 |
| 2014 | 6.06 | 8.6 | 2.88 |
| 2013 | 3.49 | 4.45 | 2.55 |
| 2012 | 4.71 | 7.23 | 3.14 |
| 2011 | 4.27 | 6.51 | 3.36 |
| 2010 | 3.4 | 5 | 2.22 |
| 2009 | 2.88 | 3.38 | 2.09 |
| 2008 | 2.72 | 4.77 | 1.32 |
| 2007 | 3.34 | 4.36 | 2.34 |
| 2006 | 2.58 | 3.57 | 1.65 |
| 2005 | 1.56 | 2.04 | 0.95 |
| 2004 | 2.13 | 4.51 | 1.14 |